because they are
yes
Birds are lightweight because they have hollow bones. This helps them fly.
Spongy
Hollow bones, light body, large lungs and compact skeletal system.
Like all bird bones they are relatively hollow inside, which makes them lightweight.
Its bones are hollow and extremely lightweight allowing it to fly.
they are light enough to fly
because of the muscles. constant activity promotes bones to be light and strength
makes bones lightweight by it's holes and able your bones to move much easier because it makes bones lightweight by it's holes so it's job is to make your bones lightweight and to make your bones move easier
Generally yes, except perhaps for the leg bones which are thicker and stronger.
Birds are lightweight because they have hollow bones. This helps them fly.
Birds have feathers, wings, and strong yet lightweight bones which help them fly. Their unique skeletal structure allows for efficient flight by reducing overall weight while maintaining strength.